ffs_mutex_lock
ret = ffs_mutex_lock(&epfile->mutex, file->f_flags & O_NONBLOCK);
static int ffs_mutex_lock(struct mutex *mutex, unsigned nonblock)
ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK);
ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK);
ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK);